The cohort will consist in the population of patients with CT-scan demonstrated, endoscopy-proven sigmoid diverticulitis who will be admitted in the Department of Surgery of the University Hospital Geneva from January 1st, 2010 to December 31st, 2019. At baseline, participants are between the ages of 18 and 90, and medical information will be updated every year until the end of follow-up, which is December 31st, 2020.